Water quality modeling in the Ross Barnett Reservoir

Author(s): Jackson, G.

This study presentation investigates the utilization and economic feasibility of hydrodynamic models as tools for assessing factors impacting water quality in the Ross Barnett Reservoir and the Pearl River for nutrient TMDL development. The primary focus is the development steps necessary to create a hydrodynamic model that provides transport information to subsequent application of a water quality model (WASP). Environmental Fluid Dynamics Code (EFDC) is a complex, dynamic, multi-dimensional computer model used to simulate hydrology in water bodies. The hydrodynamic model output feeds directly into the WASP water quality simulation. The secondary focus is on data acquisition and EFDC model manipulation methods for completing the hydrodynamic modeling. Monitoring was completed to create modern bathymetry of Ross Barnett Reservoir to provide accurate model cell grid representation. Temperature and dissolved oxygen profile monitoring were gathered to provide data for model output comparison. The EFDC model successfully predicted lake stratification and subsequent mixing based on changes in observed meteorological conditions. Finally, the model development costs and level of difficulty must be justified to consider broad use of this model development combination for state water quality agencies. EFDC / WASP model development tools that will reduce the development costs are in production, and should improve the usefulness of the EFDC / WASP model combination in the future.

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